Senecio lugens
Senecio jacobaea
stinking willie, tansy ragwort
1, or rarely 2–4 and loosely clustered, often purple-tinged, sparsely and unevenly tomentose.
basal usually withering before flowering;
cauline ± evenly distributed along stems;
distal slightly smaller; ovate to broadly ovate, bases tapered, usually 1–3-pinnate, ultimate margins dentate;
lobes obovate to spatulate, petiolate.
compound corymb-like arrays;
bracts conspicuous but small.
widely cylindric or urn-shaped.
~13;
rays 8–12 mm.
60–70+.
13, 3–4(5);
tips black or dark green.
2–6 bractlets, inconspicuous, usually < 2 mm.
0.75–1.3 mm, sparsely hairy or glabrous.
(10)20–60+.
=40.
Senecio lugens
Senecio jacobaea
Disturbed areas, pastures, roadsides. Flowering May–Sep. 0–1600 m. Casc, CR, Est, Sisk, WV. CA, ID, WA; north to British Columbia, northeast to MT, northeastern North America; Europe. Exotic.
Senecio jacobea is an introduced weed, originally from Europe. It establishes in places with cool, wet summers and is particularly toxic to livestock. In most states where it occurs, this species has been declared a noxious weed.
Debra Trock
- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
PNW Herbaria, Turner Photog. 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
